621919983 has 4 divisors (see below), whose sum is σ = 829226648. Its totient is φ = 414613320.

The previous prime is 621919943. The next prime is 621919999. The reversal of 621919983 is 389919126.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 621919983 - 2¹⁴ = 621903599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621919943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103653328 + ... + 103653333.

It is an arithmetic number, because the mean of its divisors is an integer number (207306662).

Almost surely, 2^621919983 is an apocalyptic number.

621919983 is a deficient number, since it is larger than the sum of its proper divisors (207306665).

621919983 is a wasteful number, since it uses less digits than its factorization.

621919983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207306664.

The product of its digits is 209952, while the sum is 48.

The square root of 621919983 is about 24938.3235803853. The cubic root of 621919983 is about 853.5811919196.

The spelling of 621919983 in words is "six hundred twenty-one million, nine hundred nineteen thousand, nine hundred eighty-three".